<template>
	<el-container class="home-container">
		<!-- 头部区域 -->
	  <el-header>
		  <div>
			  <img src="../assets/heima.png" alt="">
			  <span>电商后台管理系统</span>
		  </div>
	  <el-button type="info" @click="logout">退出</el-button>
	  </el-header>
	  
	  <!-- 页面主体区 -->
	  <el-container>
		  <!-- 侧边栏 -->
	    <el-aside :width="isCollapse ? '64px' : '200px' ">
			<div class="toggle-button" @click="toggleCollapse">|||</div>
			<!-- 侧边栏菜单 -->
			 <el-menu background-color="#333744" text-color="#fff" active-text-color="#409eff" unique-opened :collapse = "isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">
				  <!-- 一级菜单 -->
			      <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
					  <!-- 一级菜单模板区 -->
			        <template slot="title"> 
						<!-- 图标 -->
			          <i :class="iconsObj[item.id]"></i>
					  <!-- 文本 -->
			          <span>{{item.authName}}</span>
			        </template>
					
			        <!-- 二级菜单 -->
			<el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
				<!-- 二级菜单模板区 -->
				<template slot="title">
					<!-- 图标 -->
				  <i class="el-icon-menu"></i>
				  <!-- 文本 -->
				  <span>{{subItem.authName}}</span>
				</template>
			</el-menu-item> 
			      </el-submenu>
			    </el-menu>
		</el-aside>
		<!-- 右侧内容主体 -->
	    <el-main>
			<!-- 路由占位符 -->
			<router-view></router-view>
		</el-main>
	  </el-container>
	</el-container>
</template>

<script>
	export default {
		data() {
			return {
				menulist: [],
				iconsObj: {
					'125': 'iconfont icon-users',
					'103': 'iconfont icon-tijikongjian',
					'101': 'iconfont icon-shangpin',
					'102': 'iconfont icon-danju',
					'145': 'iconfont icon-baobiao',
				},
				// 是否折叠
				isCollapse: false,
				// 被激活的链接地址
				activePath: ''
			}
		},
		created() {
			this.getMenuList();
			this.activePath = window.sessionStorage.getItem('activePath');
		},
		methods: {
			logout() {
				window.sessionStorage.clear();
				this.$router.push('/login');
			},
			// 获取所有的菜单
			async getMenuList() {
				const {data: res} = await this.$http.get('menus')
				if (res.meta.status !==200) return this.$message.error(res.meta.msg)
				this.menulist = res.data;
				console.log(res);
			},
			// 点击按钮，切换菜单的折叠与展开
			toggleCollapse() {
				this.isCollapse = !this.isCollapse;
			},
			// 保存链接的激活状态
			saveNavState(activePath) {
				// activePath状态其他页面也要 用到，所以放在会话中
				window.sessionStorage.setItem('activePath', activePath);
				this.activePath = activePath;
			}
		}
	};
</script>

<style lang="less" scoped>
	.home-container{
		height: 100%;
	}
	
	.el-header {
		display: flex;
		justify-content: space-between;
		background-color: #373D41;
		padding-left: 0;
		align-items: center;
		color: #fff;
		font-size: 20px;
		> div {
			display: flex;
			align-items: center;
			span {
				margin-left: 15px;
			}
		}
	}
	
	.el-aside {
		background-color: #333744;
		.el-menu {
			border-right: none;
		}
	}
	
	.el-main {
		background-color: #eaedf1;
	}
	
	.iconfont {
		margin-right: 10px;
	}
	
	.toggle-button {
		background-color: #4A5064;
		font-size: 10px;
		line-height: 24px;
		color: #fff;
		text-align: center;
		letter-spacing: 0.2em;
		cursor: pointer;
	}
</style>
